Removed a test assertion that depended on primary key ordering. The test doesn't validate anything significant, and fails under Postgres. Thanks to Tobias McNulty and the magical Caktus buildbot for pointing out the problem.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13923 bcc190cf-cafb-0310-a4f2-bffc1f526a37